JPS6226581Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a fan device for cooling an automobile engine.

As is well known, there are two types of cooling methods for automobile engines: water-cooling and air-cooling, and fans are used in both types.

In the case of a water-cooled engine, the fan acts to force the air to blow through the radiator, and is a part that promotes heat exchange in the radiator, and in the case of an air-cooled engine, it acts to force the air to blow through the radiator. , a component that promotes heat dissipation.

By the way, the fan is generally driven to rotate by a part of the output of the engine,
Normally, the input is from a crank pulley fixed to the end of the crankshaft that protrudes outside the engine, via an endless belt called a fan belt, which rotates as soon as the engine starts and continues to rotate until the engine is stopped. This forces air to flow to the radiator or directs air to the engine itself.

This has resulted in problems such as extended warm-up time and overcooling when driving at high speeds in cold weather.

Another problem is that when driving at high speeds, as the engine speed increases, the fan speed also increases, resulting in an unnecessary increase in fan noise.

For example, in the case of a water-cooled engine, the cooling water system is equipped with a thermostat that controls the flow of cooling water to the radiator. The structure is such that cooling water does not flow to the radiator, and when the cooling water temperature reaches 70°C, the cooling water flows to the radiator to cool it down.This makes it easy to warm up the air, and the fan is attached to the fan support member via a fluid coupling. When the engine speed exceeds a certain set value, such as when driving at high speed, torque transmission to the fan is cut off by the action of fluid coupling, which reduces fan noise and overcooling. I'm trying to avoid it.

However, even if the thermostat prevents the radiator from being used when the engine coolant temperature is low, the fan continues to rotate, increasing the engine load by that amount, and the fluid coupling If only installed, the fan will continue to rotate unless the engine speed becomes extremely high, so in recent years, in addition to the use of thermostats and fluid couplings, devices have been developed to quickly cut off torque transmission to the fan when necessary. A torque transmission means (for example, an electromagnetic clutch) that can be disconnected or disconnected is provided between the input rotating member and the fan support member, so that the rotation speed becomes high when starting the engine, driving at high speed in cold weather, or exceeding the limit of the fan's air blowing capacity. In other cases, the fan can be stopped from rotating, but when the car is running, the fan rotates due to the wind pressure, and it does not rotate due to power. It continues to rotate without change.

Also, even when the vehicle is stopped and warmed up, the input rotating member rotates at a considerable speed (500 to 600 rpm even when the engine is idling), so the fan support member rotates. , Juan idles.

Here, an example of a conventional fan device with an electromagnetic clutch will be explained with reference to FIG. 1.A belt 2 is stretched around a fan pulley 1 as an input rotating member and an engine crank pulley (not shown). This fan pulley 1
is constantly rotating while the engine is running.

The fan pulley 1 is an annular member having an annular groove 1A, and a boss portion 1B is fixed to an input shaft 4 of a water pump 3 attached to the engine, and is attached to a casing 3A of the water pump 3, which is a fixed member, via a mounting plate 5. An annular field core 6 fixed to the annular groove 1A is concentrically inserted into the annular groove 1A.

On the other hand, a fan support member 8 is concentrically attached to the boss portion 1B via a bearing 7.

The fan support member 8 includes a disk 9 and a casing 1.
0, and the casing 10 has a short axis 11 in the center.
has.

An inner rotating member (not shown in detail) of a fluid coupling ring 12 is fitted onto the short shaft 11, and a boss portion 13A of a fan 13 is fitted onto the outer rotating member of the fluid coupling ring 12.

Disc 9 and casing 1 of fan support member 8
0 is integrally fixed to the disk 9 from the peripheral wall of the casing 10 by a plurality of bolts 14, and a ring-shaped armature 15 is attached to the surface of the disk 9 on the fan pulley side, and a return plate spring is attached to the disk 9. It is mounted movably in the axial direction by a spring 16.

The return spring 16 has one end attached to the rivet 1 at a position where the armature 15 is divided into three equal parts in the circumferential direction.
7, and the other end is fixed to the disk 9 by a rivet (not shown), so that the armature 15 is supported so as to directly face a wall surface 1a perpendicular to the axis of the fan pulley 1 serving as the input rotating member.

The armature 15 has an electromagnetic coil 18 inserted into the annular groove 6A of the field core 6.
It is excited by applying a voltage to the fan pulley 1, and is magnetically attracted to the wall surface 1a of the fan pulley 1.

The fan 13 is rotated by the magnetic attraction of the armature 15 to the fan pulley 1.

Further, the electromagnetic clutch may be a reverse action electromagnetic clutch. In this case, the armature 1 is set so that the connection between the fan pulley 1 and the fan support member 8 is quickly severed by applying a voltage to the electromagnetic coil 18.
5, permanent magnets of the same shape are used as polarities that repel and separate from the fan pulley 1.

In this example, the fan 13 is a propeller fan, but it may be a centrifugal fan that forces air into a cooling wind tunnel, as in a forced draft air-cooled engine.

Since there is no water pump in an air-cooled engine, the field core 6 may be fixed to another fixed member, and the input rotating member may be a rotating body directly connected to the crankshaft.

In a fan device with an electromagnetic clutch having such a structure, the torque transmission from the input rotating member to the fan support member is interrupted by the operation of the electromagnetic clutch, and the fan is supposed to stop rotating. In reality, the fan rotates as the input rotating member rotates, or if it is running, it rotates at a fairly high speed due to wind pressure, making it impossible to stop the fan.

Based on the above-mentioned viewpoint, this invention provides an automobile fan device that can reliably keep the fan in a stopped state as required.The input rotating member and the fan support member are arranged on the same axis, The rotating member and the fan support member are connected by a flexible torque transmission means, and a flange-like magnetic member is fixed to the fan support member side in a concentric arrangement,
One or more electromagnets for preventing fan slippage, which are movably supported in the axial direction via return springs on the fixed member side facing the magnetic member, are opposed to the flange portion of the magnetic member. There are characteristics.

Next, the fan device of this invention will be explained by way of example with reference to the drawings.

Note that the fan device of this invention is a fan device in which a mechanism for preventing the fan from idling is added to the fan device already explained with reference to FIG. 1, so the structure and components of the fan device shown in FIG. For the same structures and members, the previous explanation with reference to FIG. 1 will be referred to, and the details will not be explained redundantly.

FIG. 2 shows a first embodiment of the fan device of this invention in a longitudinal sectional side view with a portion cut away. As shown in the drawing, 1 is a fan pulley as an input rotating member, 1A is an annular groove, 1B is a boss portion, 1
a is the wall surface, 2 is the belt, 3 is the water pump, 3
A is the casing, 4 is the input shaft of the water pump,
5 is a mounting plate, 6 is a field core, 6A is an annular groove, 7 is a bearing, 8 is a fan support member, 9 is a disk, 10 is a casing, 11 is a short shaft, 12
13 is a fluid coupling, 13 is a fan, 13A is a boss, 14 is a bolt, 15 is an armature, 16
17 is a rivet, and 18 is an electromagnetic coil.

A flange-shaped magnetic material member 2 is attached to the disk 9 of the fan support member 8 by a plurality of bolts 19.
0 are fixed in a concentric arrangement.

A U-shaped fitting 21 is fixed by bolts 22 to the end face of the water pump 3 serving as a fixed member, which is opposed to the flange portion 20A of the magnetic member 20.
An electromagnet 24 is attached to this U-shaped fitting 21 via a return leaf spring 23.

Although a plurality of electromagnets 24 may be attached at two or three equiangularly divided positions in the circumferential direction, only one electromagnet 24 is usually sufficient.

The leaf spring 23 supporting the electromagnet 24 is
As shown in the rear view in the figure, the U-shaped bracket 21
On the other hand, while fixing the center part with rivets 25,
Portions near the left and right ends of the field core 26 of the electromagnet 24 are fixed to left and right protruding ears 26A, 26A with rivets 27, 27, respectively.

Electromagnet 24 and flange portion 2 of magnetic material member 20
The opposing gap S in the non-energized state with respect to 0A can be adjusted by changing the thickness of the shim 28 interposed between the U-shaped fitting 21 and the water pump 3.

The electromagnet 24 has a built-in electromagnetic coil 30 from which a conducting wire 29 (see FIG. 3) is drawn out, and this electromagnetic coil 30
The field core 26 excited by applying a voltage to the flange portion 20 of the magnetic member 20
Magnetically attracts A.

The control circuit is set so that voltage can be applied to the electromagnetic coil 30 when the armature 15 is separated from the input pulley 1.

In the fan device of this invention configured as described above, when the armature 15 is separated from the fan pulley 1 and torque is not transmitted to the fan support member 8, when a voltage is applied to the electromagnetic coil 30 of the electromagnet 24, the magnetization is activated. The field core 26 moves toward the flange portion 20A of the magnetic member 20 against the restoring force of the leaf spring 23, and is magnetically attracted thereto to prevent the magnetic member 20 from rotating.

Since the magnetic member 20 that magnetically attracts the field core 26 of the electromagnet 24 is integrated with the fan support member 8, the fan 13 does not rotate while the electromagnet is magnetically attracted to the flange portion 20A.

Therefore, if a control circuit is formed so that voltage can be applied to the electromagnetic coil 30 when it is desirable to keep the fan 13 from rotating, such as during warm-up or high-speed driving, the fan 13 It can completely eliminate twisting and rotation due to wind pressure.

FIG. 4 shows a second embodiment of the fan device of this invention in a side view with only the upper half partially cut away.

This second embodiment differs from the first embodiment in the shape of the magnetic member 20' and its mounting position.

That is, in contrast to the first embodiment in which the member 20 made of magnetic material is fixed to the disk 9 of the fan support member 8, in this second embodiment, the electromagnet 24 is attached to the outward flange portion 20'A of the member made of magnetic material 20'. The magnetic attraction is similar to the first embodiment, but the inward flange portion 20'B is sandwiched between the flange 12A of the outer rotating member of the fluid coupling 12 and the boss portion 13A of the fan 13. , are fixed with a plurality of bolts 31.

In this way, in the first embodiment, the magnetic material member 20 is fixed to the input side of the fluid coupling 12, whereas in the second embodiment, the magnetic material member 20' is fixed to the output side of the fluid coupling 12, that is, in the second embodiment. , Juan 13
The second embodiment has the same effect as if it were directly attached to the fluid coupling 1.
Completely fan 1 without being affected by 2.
This embodiment is superior to the first embodiment in that it is possible to fix 3.

Since the other structure of the second embodiment is the same as that of the first embodiment, in FIG. However, the explanation thereof will be omitted.

As is clear from the above description, when the fan device of this invention is stopped, it is possible to reliably prevent idling conditions such as tangling with the input rotating member and rotation due to wind pressure, and in particular, it is possible to prevent the electromagnet from rotating in the axial direction. Since the movable part is magnetically attracted to a flange-shaped magnetic member, a large braking force can be obtained even with the use of a small-capacity electromagnet, and the structure is simple, making manufacture, adjustment, and maintenance easy. It has the advantage of providing excellent effects such as:

[Brief explanation of the drawing]

Fig. 1 is a longitudinal side view with a part cut out showing an example of a conventional fan device with an electromagnetic clutch, and Fig. 2 is a longitudinal cross-sectional view showing a first embodiment of the fan device of this invention with a part cut out. 3 is a rear view showing the mounting structure of the electromagnet for preventing fan idling, and FIG. 4 is a longitudinal sectional side view showing the second embodiment with only the upper half thereof partially cut away. In the drawings, 1... Juan Pulley, 1A...
Annular groove, 1B...Boss part, 1a...Wall surface, 2...
Belt, 3...Water pump, 3A...Casing, 4...Water pump input shaft, 5...Mounting plate, 6...Field core, 6A...Annular groove,
7...Bearing, 8...Fan support member, 9...
... Disk, 10 ... Casing, 11 ... Short shaft, 12 ... Fluid coupling, 13 ... Fan, 13A ... Boss part, 14 ... Bolt, 15 ...
... Armature, 16 ... Return spring, 17 ... Rivet, 18 ... Electromagnetic coil, 19 ... Volt,
20, 20'...Magnetic material member, 20A, 20'
A, 20'B...flange part, 21...U-shaped fitting, 22...bolt, 23...plate spring, 24...
Electromagnet, 25... Rivet, 26... Field core, 26A... Ear part, 27... Rivet, 28
...Shim, 29...Conductor, 30...Electromagnetic coil,
31...Bolt, S...between opposing sides.

Claims (1)

[Scope of utility model registration request] The input rotating member and the fan supporting member are arranged on the same axis, and the input rotating member and the fan supporting member are connected by a flexible torque transmitting means,
A flange-like member made of a magnetic material is fixed in a concentric arrangement to the side of the fan support member, and one or more idling fans are supported movably in the axial direction via a return spring on the side of the fixed member opposite to the member made of the magnetic material. A fan device for an automobile, comprising a prevention electromagnet facing a flange portion of the magnetic member.